The Compiz Fusion Icon is a simple panel applet for starting and controlling Compiz Fusion. Upon launch, it will attempt to start Compiz Fusion automatically. You may need to select a window decorator, if one does not appear.

In most cases, you can find Compiz Fusion under Applications -> System Tools -> Compiz Fusion Icon, or the equivalent in your desktop environment's menu. You can also run fusion-icon & from a console.